BingBumpier
"Artist" is one of those words that hides enormous variation. A studio painter making large oils for gallery shows, a children's book illustrator on a yearly contract, a tattooist booking weeks out, a freelance video animator working for ad agencies, and a glassblower running a small studio are all artists. Their daily lives have very little in common.
Almost no working artist supports themselves entirely on speculative gallery sales. The ones who do are a small minority who have already broken through. The much larger group earns a living through some combination of: commissioned work, teaching, commercial illustration or design, public art commissions, grants and residencies, licensing of images, social media and tutorial income, and occasional sales of finished pieces. Most working artists are running a small business with multiple revenue streams.
For most disciplines, a sustainable practice means showing up to the studio on a schedule, not just when inspiration strikes. Three to five days a week, three to six hours a day, is a common rhythm. The work that comes out of that consistency is what fills shows, supplies galleries, and feeds the body of work that grant applications and gallery proposals require. Romantic ideas about the tortured genius producing in mad bursts make for good biographies but bad careers.
Make a lot of work. Show it. Apply to things. Be the most reliable artist your collaborators have ever worked with. Keep your overhead low for as long as possible so you have time to develop. None of this is glamorous. The artists you have heard of mostly did all of it.